Hi Guys. I have a sliding patio door on the porch which gives the only viable acces to the house. There is a multi-point lever locking mechanism operated by a black bit of metal which you push up to open/down to lock. I'm guessing that the spindal of this black lever goes through a square collar in the door frame which is connected to the multi-point locks. Well, this 'collar' or what ever it is seems to have disintergrated and the lever moves freely without operating the locks. Question is: (sorry it's taken so long) - Can I replace the broken part of the mechanism, if so, where do i buy it from, and how do I gain access to it? (There is no access from removing the handles). Thank you.